Compilare: user.cpp: In function ‘std::vector<lin> batch(std::vector<lin>)’: user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i < r.size(); i ++ ) { ^ user.cpp: In function ‘double get_y(std::vector<lin>, double)’: user.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( i + pas < b.size() && b[i + pas - 1].ins( b[i + pas] ) <= x ) ^ user.cpp: In function ‘int main()’: user.cpp:68:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &n, &m, &q ); ^ user.cpp:72:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &x, &y, &c ); ^ user.cpp:88:54: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d%d", &x, &y, &minV, &maxV ); ^ user.cpp:118:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &a, &b ); ^